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B nạ
F1 F1
F2
10%10% 10%10%
10%10%
Đi u Ki n:ề ệB o tr tr c ti p 4 F1 nh n 10% các F1.ả ợ ự ế ậB o tr tr c ti p 6 F1 nh n 10% các F2.ả ợ ự ế ậ